# Enter your code here. Read input from STDIN. Print output to STDOUT


import fileinput


loop = fileinput.input()
code = []

for i in fileinput.input():
    add = i.strip().split()
    for j in add:
        code.append(j)

for i in loop:
	code.append(i)

f = 0
c = 0 
for i in range(len(code[1])):
    if code[1][i] == "U":
        c += 1
    if code[1][i] == "D":
        c -= 1
    if c == 0 and code[1][i] == "U":
        f += 1
    #print c
print f